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Transcript

  • 1. Inheritance Chapter 7
  • 2. Inheritance: the way genes are passed down.
    • If a father doesn’t have a leg does that mean his children will be born with out a leg????
  • 3. Hundreds of years ago people knew that somehow certain traits would be passed on to their children .
  • 4. Gregor Mendel was the first to predict the outcome of inheritance. The study of inheritance is Genetics .
  • 5.
    • Mendel did several different experiments on pea plant.
    • This is an example of wrinkled and smooth seeds.
  • 6. Genes and Alleles
    • A gene is a specific piece of DNA.
    • You have two genes that code for the same thing (ex. Height). Each of those two genes is called an allele.
    • So if something had the genes Aa one allele would be “A” the other would be “a”).
  • 7. Why two alleles for every gene?
    • Because organisms get 2 sets of chromosomes ……….one from the mother and one from the father.
  • 8. Phenotype
    • Is the physical characteristics of the trait.
    • In most cases it is what we can “see”.
    • Example: Freckles, dimples, attached earlobes etc.
  • 9. Genotype
    • Is the actual alleles that make up the trait.
    • In most all cases this is represented by 2 letters.
    • Example: AA, Aa, aa
  • 10. Dominant
      • A dominant trait is a trait that covers or hides the other trait of an allele.
    • For example, dark colors in hair usually overshadow the other allele.
    • In this class Dominant will always be represented with a capital letter.
    • Example: Say “D” is the allele for black hair and “d” is the allele for blond. The if an animal had Dd then it would have black hair.
  • 11. Recessive
    • A recessive trait is the trait that is hidden by the dominant trait.
    • In an animal with Dd for hair color the recessive allele is “d”.
    • The animal carries a gene for blond hair but you can’t tell by looking at it.
  • 12. The End